Pioneer you know all the examples and symptoms you described, eyeglasses, clothing, and cars, none of those thing cause and are diseases. I seriously doubt anyone who needs eye-glasses would agree with or care about your assertion that they cause weakness , not would any one who needs clothing to protect them from the weather or a car to transport them.
Man lets keep thing in perspective. So called western civilization despite all of its ills has improved the quality of life, certainly if you measure it by life expectancy and infant mortality in particular.
There are scientists you argue that modem man evolved because we cook food, not the other way around. Cooking food actually reduces greatly the amount of energy we need to exert in order to consume it.
Man can consume meat just fine, we are adapted to do it. The whole notion that homo spaiens evolved to eat only vegetables flies in the face off all the available science, despite what some vegetarians might have you believe. Those vegans have the luxury of being vegetarians because they can go down to the Whole Foods and buy this stuff with relatively little effort. If these "nuts" were in the wild they would die from starvation or malnutrition come the first winter.
Whenever someone starts a sentence with, "I believe God...." I stop listening, because what man know the mind of God? Who would presume to know what God knows. That is like an amoeba presuming to know what Einstein knows.
Of course man was meant to eat meat. We are omnivorous.